Socket device



April 20, 1943.

c. L. HALL r AL SOCKET DEVICE Filed April 16, 1941 wwtou Gemgc 17.' Gra C'a'esL. HaZZ. %u Jada,

Patented Apr. 2.0, 1943 U-Nl TED STATES PAT EN T 'F F I C E sooKE'r DEVIC Mich assigno's to United-'Carr Fastener Corporation, Cambridge, Mass., a corpo'ration of Massachusetts Application -A ri 16, 1941-, Serial No. 388394 (CI. 'toi-63') V 6 lams.

The present inventi'on `re'ates to resistance socket in'stallation's of the type designed -for the operation or an leetric lamp or other s'igna or device by reduc'ed volta'ge 'and aim's generally to improve :existing installations of this kind.

In the aecoinpanying drawing we have illustrated a preferred form of our -improved 'instaliatio'n in which:

1 is -a side elevation of the installation embody'ing the invention;

Fig. 2 is 'an end view thereof;

Fig. 3 is a, longituainal sectional "View taken -on the !me --I of Fig. 2;

Fg. 4 'is a p rsp'ective view of the grounding lug: and

mg. 5 is a se'cticinal *View of a modified form of socket. e

According to the invention, an electric lamp o or other electric'al signal or device may be mounted in a sheet metal socket ll, embodying our invention, the entire assembly being simple and compact and safe in handling.

1 Advantageously the socket Il is of the snap-on type adapted to be snapped upon an apertured support. One form of socket of this type is illustrated and comprises a sheet metal socket member having an outwardly flared end I2. An attaching ring !3 formed with a plurality of bowed resilient flngers N is Secured to the flared end |2 by means of a cap ring IS so that the fingers surround the open socket end and extend outwardly beyond the oap ring !5. A lamp bulb lfl may be inserted in the open socket end and secured therein by reason of the bayonet slot IE, and the assembled socket and lamp may be attached to a support I'I by a direct push, the fingers ll having a snap fastener engagement with the edge of the support H surrounding an aperture s theren through which the lamp o is passed.

Current may be supplied to the lamp from any suitable source, such as a battery IS, in the case of motor vehicle signals, one lead 20 being connected to a lamp base contact (not shown) within the socket, as is usual and the other terminal 2! grounded to the socket shell.

In certain installations it is desired to supply a relative low or reduced voltage to the lamp or signal when the voltage supply is higher than desired and it is our aim to combine with the socket a suitable resistance to provide for the reduced voltage. According to the present invention, this is accomplished by embodying a resistance to the grounded sides of the circuit.

In the illustrated embodiment a grounding lug or member 22 is provided which is 'preferaby L-'Shaped, one leg of which i-'s form'ed with an 'aperture 23 adapted to fit over 'a tubular 'rivet or 'extension 2'4 on the 'end of the 'so'cket il opposite the a'm' -re'ceiving end. The apex or the `lug 22 is preferably bent as at 25 to conim-m to the contour of a'n annuar bead 28 on the s'o'ck'et ll. The other" e'g '21 of the groundmg lug is preferabiy straight 'for a 'substantial len th, for contact with theshell of the socket H, and terminat'e's in an eye '29.

Resist'ance is provided by 'a eoil 28 compo'sed 'or a pu'raiity or windin'gs of a n insulated condut'or 30 wrap ed tightly around the socket 'shell and leg 21 of 'the grounding lug and electrio'aiy connected at one end 'to the eye 23. The other ena of the cohductor 30 is connected to a suitable connecter 3! 'mounted on an insuiated arin 32 tted over the rivet 24 and fastened thereby to the end of the socket. As the tubular rivet is flattened over the outer face of the insulated arm 32, the arm and apertured end oi the lug 22 will be firmly secured in assembled relation with the lug 22 in electrical contact with the shell of the socket at the end and throughout a substantial length of the side thereof.

Preferably the conductor 30 is a glass insulated wire although other types of insulation may be used.

The improved resistance socket provides a simple, compact and eflioient construction that may be associated. with the snap-on type of socket member, and the entire lamp and socket assembly readily inserted in and removed from an apertured support by a direct axial thrust.

Although the invention is particularly adapted for providing a resistance for snap-on types of socket as above described, it is not restricted to such use. Alternately, the socket may be mounted on an insulated support 33 (see Fig. 5), being connected thereto by a tubular rivet 24 in the manner above described. The member 33 thus serves as a support for the socket as well as an insulated arm for the spaced Connector 34. In this type of installation, obviously the snap fastener fingers are not necessary and the lampreceiving end of the socket may be plain.

Our invention is not to be interpreted narrowly as limited to the specific Construction shown and described, which is intended merely as illustrative, but includes as well equivalent Constructions as fall within the scope of the appended claims.

We claim:

1. A resistance socket installation comprising a sheet metal socket formed at one end for the 'eception of an electrical device, an electrical circuit for said socket including a base contact within said socket for said device and a resistance coil wrapped around the body of the socket, one end of the coil being electrically connected to said socket and the other end being insulated therefrom and connected to a source of electrical energy.

2. An electric socket installation comprising a sheet metal socket formed at one end for the reception of an electrical device, an electric circuit for said device including an L-shaped grounding lug Secured to said socket with one leg thereof disposed longitudinally of'said socket and in contact therewith, a resistance coil wrapped around said socket and lug, one end of said conductor being electrically. connected' to said lug and the other end being electrically connected to a source of electrical energy.

3. A resistance socket installation comprising an apertured support, a socket member formed of tubular sheet metal having a lamp-receiving opening at one end, means adjacent the lampreceiving end of said socket member for snapfastening engagement with the aperture of said support, an electrical circuit for said socket including a base contact 'within said socket, and a resistance -'coil wrapped 'directly around the body of said socket, one end ofthe coil being grounded to said socket and the other end connected to a terminal insulated therefrom.

4. A resistancesocket installation comprising an apertured. support, a socket member formed of tubular sheet metal having a lamp-receiving opening at one end, means adjacent the lampe receiving end of said socketmember for snapfastening engagement with the aperture of said support, an electrical* circuit for said socket including a base contact within said socket, and a resistance coil wrapped directly around the body of said socket, a groundng lug fastened to said socket and formed with a part extending' longitudinally thereof in contact therewith and positioned between the socket and the coil, one end of the coil being connected to the grounding lug and the other end connected to` a terminal insulated therefrom. i

5. A resistance socket installation comprising a` socket member formed of tubular sheet metal having a lamp-receiving opening at one end and a tubular rivet of reduced diameter at the other i end, an e'lectrical 'circuit for said socket including a contact within said socket and a resistance coil wrapped directly around the body of the socket and grcunded at one end thereto, an insulating body secured to said socket by said tubular rivet, and a terminal on said insulating body 0 spaced from said socket for connection with the end of the resistance. coil oppositev the 'end grounded to the socket. I J 6. A resistance socket installation comprising a socket member formed of tubular sheet metal 5 having a lamp-receiving opening at one end and a tubular rivet of reduced diameter at the other end, an electrical circuitfor said socket includ ing a contact within said socket and a resistance coil wrapped directly around the body of the socket, an L-shaped metal grounding member having one end positioned on said rivet and formed with a part extending longitudinally oi the socket and making a line contact therewith and a terminal on said insulating body spaced 5 from said socket for connection with the end of the resistance coil opposite the end grounded to the socket. i u CHARLES L. 'HALI i GEORGE F. CRAM r 

